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0c86edc0 AZ |
1 | /* |
2 | * RTC subsystem, interface functions | |
3 | * | |
4 | * Copyright (C) 2005 Tower Technologies | |
5 | * Author: Alessandro Zummo <a.zummo@towertech.it> | |
6 | * | |
7 | * based on arch/arm/common/rtctime.c | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/rtc.h> | |
15 | ||
ab6a2d70 | 16 | int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm) |
0c86edc0 AZ |
17 | { |
18 | int err; | |
0c86edc0 AZ |
19 | |
20 | err = mutex_lock_interruptible(&rtc->ops_lock); | |
21 | if (err) | |
22 | return -EBUSY; | |
23 | ||
24 | if (!rtc->ops) | |
25 | err = -ENODEV; | |
26 | else if (!rtc->ops->read_time) | |
27 | err = -EINVAL; | |
28 | else { | |
29 | memset(tm, 0, sizeof(struct rtc_time)); | |
cd966209 | 30 | err = rtc->ops->read_time(rtc->dev.parent, tm); |
0c86edc0 AZ |
31 | } |
32 | ||
33 | mutex_unlock(&rtc->ops_lock); | |
34 | return err; | |
35 | } | |
36 | EXPORT_SYMBOL_GPL(rtc_read_time); | |
37 | ||
ab6a2d70 | 38 | int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm) |
0c86edc0 AZ |
39 | { |
40 | int err; | |
0c86edc0 AZ |
41 | |
42 | err = rtc_valid_tm(tm); | |
43 | if (err != 0) | |
44 | return err; | |
45 | ||
46 | err = mutex_lock_interruptible(&rtc->ops_lock); | |
47 | if (err) | |
48 | return -EBUSY; | |
49 | ||
50 | if (!rtc->ops) | |
51 | err = -ENODEV; | |
52 | else if (!rtc->ops->set_time) | |
53 | err = -EINVAL; | |
54 | else | |
cd966209 | 55 | err = rtc->ops->set_time(rtc->dev.parent, tm); |
0c86edc0 AZ |
56 | |
57 | mutex_unlock(&rtc->ops_lock); | |
58 | return err; | |
59 | } | |
60 | EXPORT_SYMBOL_GPL(rtc_set_time); | |
61 | ||
ab6a2d70 | 62 | int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs) |
0c86edc0 AZ |
63 | { |
64 | int err; | |
0c86edc0 AZ |
65 | |
66 | err = mutex_lock_interruptible(&rtc->ops_lock); | |
67 | if (err) | |
68 | return -EBUSY; | |
69 | ||
70 | if (!rtc->ops) | |
71 | err = -ENODEV; | |
72 | else if (rtc->ops->set_mmss) | |
cd966209 | 73 | err = rtc->ops->set_mmss(rtc->dev.parent, secs); |
0c86edc0 AZ |
74 | else if (rtc->ops->read_time && rtc->ops->set_time) { |
75 | struct rtc_time new, old; | |
76 | ||
cd966209 | 77 | err = rtc->ops->read_time(rtc->dev.parent, &old); |
0c86edc0 AZ |
78 | if (err == 0) { |
79 | rtc_time_to_tm(secs, &new); | |
80 | ||
81 | /* | |
82 | * avoid writing when we're going to change the day of | |
83 | * the month. We will retry in the next minute. This | |
84 | * basically means that if the RTC must not drift | |
85 | * by more than 1 minute in 11 minutes. | |
86 | */ | |
87 | if (!((old.tm_hour == 23 && old.tm_min == 59) || | |
88 | (new.tm_hour == 23 && new.tm_min == 59))) | |
cd966209 | 89 | err = rtc->ops->set_time(rtc->dev.parent, |
ab6a2d70 | 90 | &new); |
0c86edc0 AZ |
91 | } |
92 | } | |
93 | else | |
94 | err = -EINVAL; | |
95 | ||
96 | mutex_unlock(&rtc->ops_lock); | |
97 | ||
98 | return err; | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(rtc_set_mmss); | |
101 | ||
ab6a2d70 | 102 | int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) |
0c86edc0 AZ |
103 | { |
104 | int err; | |
0c86edc0 AZ |
105 | |
106 | err = mutex_lock_interruptible(&rtc->ops_lock); | |
107 | if (err) | |
108 | return -EBUSY; | |
109 | ||
110 | if (rtc->ops == NULL) | |
111 | err = -ENODEV; | |
112 | else if (!rtc->ops->read_alarm) | |
113 | err = -EINVAL; | |
114 | else { | |
115 | memset(alarm, 0, sizeof(struct rtc_wkalrm)); | |
cd966209 | 116 | err = rtc->ops->read_alarm(rtc->dev.parent, alarm); |
0c86edc0 AZ |
117 | } |
118 | ||
119 | mutex_unlock(&rtc->ops_lock); | |
120 | return err; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(rtc_read_alarm); | |
123 | ||
ab6a2d70 | 124 | int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) |
0c86edc0 AZ |
125 | { |
126 | int err; | |
0c86edc0 AZ |
127 | |
128 | err = mutex_lock_interruptible(&rtc->ops_lock); | |
129 | if (err) | |
130 | return -EBUSY; | |
131 | ||
132 | if (!rtc->ops) | |
133 | err = -ENODEV; | |
134 | else if (!rtc->ops->set_alarm) | |
135 | err = -EINVAL; | |
136 | else | |
cd966209 | 137 | err = rtc->ops->set_alarm(rtc->dev.parent, alarm); |
0c86edc0 AZ |
138 | |
139 | mutex_unlock(&rtc->ops_lock); | |
140 | return err; | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(rtc_set_alarm); | |
143 | ||
d728b1e6 DB |
144 | /** |
145 | * rtc_update_irq - report RTC periodic, alarm, and/or update irqs | |
ab6a2d70 | 146 | * @rtc: the rtc device |
d728b1e6 DB |
147 | * @num: how many irqs are being reported (usually one) |
148 | * @events: mask of RTC_IRQF with one or more of RTC_PF, RTC_AF, RTC_UF | |
149 | * Context: in_interrupt(), irqs blocked | |
150 | */ | |
ab6a2d70 | 151 | void rtc_update_irq(struct rtc_device *rtc, |
0c86edc0 AZ |
152 | unsigned long num, unsigned long events) |
153 | { | |
0c86edc0 AZ |
154 | spin_lock(&rtc->irq_lock); |
155 | rtc->irq_data = (rtc->irq_data + (num << 8)) | events; | |
156 | spin_unlock(&rtc->irq_lock); | |
157 | ||
158 | spin_lock(&rtc->irq_task_lock); | |
159 | if (rtc->irq_task) | |
160 | rtc->irq_task->func(rtc->irq_task->private_data); | |
161 | spin_unlock(&rtc->irq_task_lock); | |
162 | ||
163 | wake_up_interruptible(&rtc->irq_queue); | |
164 | kill_fasync(&rtc->async_queue, SIGIO, POLL_IN); | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(rtc_update_irq); | |
167 | ||
ab6a2d70 | 168 | struct rtc_device *rtc_class_open(char *name) |
0c86edc0 | 169 | { |
cd966209 | 170 | struct device *dev; |
ab6a2d70 | 171 | struct rtc_device *rtc = NULL; |
0c86edc0 AZ |
172 | |
173 | down(&rtc_class->sem); | |
cd966209 DB |
174 | list_for_each_entry(dev, &rtc_class->devices, node) { |
175 | if (strncmp(dev->bus_id, name, BUS_ID_SIZE) == 0) { | |
176 | dev = get_device(dev); | |
177 | if (dev) | |
178 | rtc = to_rtc_device(dev); | |
0c86edc0 AZ |
179 | break; |
180 | } | |
181 | } | |
182 | ||
ab6a2d70 DB |
183 | if (rtc) { |
184 | if (!try_module_get(rtc->owner)) { | |
cd966209 | 185 | put_device(dev); |
ab6a2d70 DB |
186 | rtc = NULL; |
187 | } | |
0c86edc0 AZ |
188 | } |
189 | up(&rtc_class->sem); | |
190 | ||
ab6a2d70 | 191 | return rtc; |
0c86edc0 AZ |
192 | } |
193 | EXPORT_SYMBOL_GPL(rtc_class_open); | |
194 | ||
ab6a2d70 | 195 | void rtc_class_close(struct rtc_device *rtc) |
0c86edc0 | 196 | { |
ab6a2d70 | 197 | module_put(rtc->owner); |
cd966209 | 198 | put_device(&rtc->dev); |
0c86edc0 AZ |
199 | } |
200 | EXPORT_SYMBOL_GPL(rtc_class_close); | |
201 | ||
ab6a2d70 | 202 | int rtc_irq_register(struct rtc_device *rtc, struct rtc_task *task) |
0c86edc0 AZ |
203 | { |
204 | int retval = -EBUSY; | |
0c86edc0 AZ |
205 | |
206 | if (task == NULL || task->func == NULL) | |
207 | return -EINVAL; | |
208 | ||
d728b1e6 | 209 | spin_lock_irq(&rtc->irq_task_lock); |
0c86edc0 AZ |
210 | if (rtc->irq_task == NULL) { |
211 | rtc->irq_task = task; | |
212 | retval = 0; | |
213 | } | |
d728b1e6 | 214 | spin_unlock_irq(&rtc->irq_task_lock); |
0c86edc0 AZ |
215 | |
216 | return retval; | |
217 | } | |
218 | EXPORT_SYMBOL_GPL(rtc_irq_register); | |
219 | ||
ab6a2d70 | 220 | void rtc_irq_unregister(struct rtc_device *rtc, struct rtc_task *task) |
0c86edc0 | 221 | { |
0c86edc0 | 222 | |
d728b1e6 | 223 | spin_lock_irq(&rtc->irq_task_lock); |
0c86edc0 AZ |
224 | if (rtc->irq_task == task) |
225 | rtc->irq_task = NULL; | |
d728b1e6 | 226 | spin_unlock_irq(&rtc->irq_task_lock); |
0c86edc0 AZ |
227 | } |
228 | EXPORT_SYMBOL_GPL(rtc_irq_unregister); | |
229 | ||
ab6a2d70 | 230 | int rtc_irq_set_state(struct rtc_device *rtc, struct rtc_task *task, int enabled) |
0c86edc0 AZ |
231 | { |
232 | int err = 0; | |
233 | unsigned long flags; | |
0c86edc0 | 234 | |
56f10c63 AZ |
235 | if (rtc->ops->irq_set_state == NULL) |
236 | return -ENXIO; | |
237 | ||
0c86edc0 AZ |
238 | spin_lock_irqsave(&rtc->irq_task_lock, flags); |
239 | if (rtc->irq_task != task) | |
240 | err = -ENXIO; | |
241 | spin_unlock_irqrestore(&rtc->irq_task_lock, flags); | |
242 | ||
243 | if (err == 0) | |
cd966209 | 244 | err = rtc->ops->irq_set_state(rtc->dev.parent, enabled); |
0c86edc0 AZ |
245 | |
246 | return err; | |
247 | } | |
248 | EXPORT_SYMBOL_GPL(rtc_irq_set_state); | |
249 | ||
ab6a2d70 | 250 | int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq) |
0c86edc0 | 251 | { |
56f10c63 | 252 | int err = 0; |
0c86edc0 | 253 | unsigned long flags; |
0c86edc0 | 254 | |
56f10c63 AZ |
255 | if (rtc->ops->irq_set_freq == NULL) |
256 | return -ENXIO; | |
0c86edc0 AZ |
257 | |
258 | spin_lock_irqsave(&rtc->irq_task_lock, flags); | |
259 | if (rtc->irq_task != task) | |
260 | err = -ENXIO; | |
261 | spin_unlock_irqrestore(&rtc->irq_task_lock, flags); | |
262 | ||
263 | if (err == 0) { | |
cd966209 | 264 | err = rtc->ops->irq_set_freq(rtc->dev.parent, freq); |
0c86edc0 AZ |
265 | if (err == 0) |
266 | rtc->irq_freq = freq; | |
267 | } | |
268 | return err; | |
269 | } | |
2601a464 | 270 | EXPORT_SYMBOL_GPL(rtc_irq_set_freq); |